/*
 * Copyright 2012 Google Inc. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.google.dspl.validate.validator;

import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableList;
import com.google.dspl.validate.ItemReference;
import com.google.dspl.validate.violation.InvalidIdViolation;
import com.google.dspl.validate.violation.Violation;

/**
 * Validation rules for ids.
 *
 * @author Maryla Ustarroz Calonge
 */
class IdValidator {

  // This pattern is more restrictive than what is technically allowed by DSPL, but allowing
  // only computer-friendly ids is safer.
  private static final String ID_PATTERN = "[_a-zA-Z]([-._a-zA-Z0-9]){0,63}";

  private final ItemReference enclosingItemReference;

  IdValidator(ItemReference enclosingItemReference) {
    this.enclosingItemReference = Preconditions.checkNotNull(enclosingItemReference);
  }

  public void validate(String id, ImmutableList.Builder<Violation> violations) {
    Preconditions.checkNotNull(id);

    if (!id.matches(ID_PATTERN)) {
      violations.add(new InvalidIdViolation(enclosingItemReference, id, ID_PATTERN));
    }
  }
}
